CVE-2026-32762
Fixed in a distro release EPSS <1%CVSS 4.8
Rack is a modular Ruby web server interface. From versions 3.0.0.beta1 to before 3.1.21 and 3.2.0 to before 3.2.6, Rack::Utils.forwarded_values parses the RFC 7239 Forwarded header by splitting on semicolons before handling quoted-string values. Because quoted values may legally contain semicolons, a header can be interpreted by Rack as multiple Forwarded directives rather than as a single quoted for value. In deployments where an upstream proxy, WAF, or intermediary validates or preserves quoted Forwarded values differently, this discrepancy can allow an attacker to smuggle host, proto, for, or by parameters through a single header value. This issue has been patched in versions 3.1.21 and 3.2.6.
Products: Rack
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| RubyGems | rack | 3.1.21 |
| RubyGems | rack | 3.2.6 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | kube-fluentd-operator | 1.18.2-r60 |
| Chainguard | kube-fluentd-operator | 1.18.2-r67 |
| Chainguard | logstash-8.17 | no fix |
| Chainguard | logstash-8.17-iamguarded-compat | no fix |
| Chainguard | logstash-8.17-with-output-opensearch | no fix |
| Chainguard | logstash-8.18 | no fix |
| Chainguard | logstash-8.18-iamguarded-compat | no fix |
| Chainguard | logstash-8.18-with-output-opensearch | no fix |
| Chainguard | logstash-8.19 | 8.19.14-r3 |
| Chainguard | logstash-8.19-iamguarded-compat | 8.19.14-r3 |
| Chainguard | logstash-8.19-with-output-opensearch | 8.19.14-r3 |
| Chainguard | logstash-9.0 | 9.0.8-r20 |
| Chainguard | logstash-9.0-iamguarded-compat | 9.0.8-r20 |
| Chainguard | logstash-9.0-with-output-opensearch | 9.0.8-r20 |
| Chainguard | logstash-9.1 | 9.1.10-r6 |
| Chainguard | logstash-9.1-bitnami-compat | 9.1.10-r6 |
| Chainguard | logstash-9.1-iamguarded-compat | 9.1.10-r6 |
| Chainguard | logstash-9.1-with-output-opensearch | 9.1.10-r6 |
| Chainguard | logstash-9.2 | 9.2.8-r2 |
| Chainguard | logstash-9.2-iamguarded-compat | 9.2.8-r2 |
| Chainguard | logstash-9.2-with-output-opensearch | 9.2.8-r2 |
| Chainguard | logstash-9.3 | 9.3.3-r2 |
| Chainguard | logstash-9.3-iamguarded-compat | 9.3.3-r2 |
| Chainguard | logstash-9.3-with-output-opensearch | 9.3.3-r2 |
| Chainguard | pact-broker-docker | 2.137.0.2.118.0-r4 |
| Chainguard | pact-broker-docker-fips | 2.137.0.2.118.0-r2 |
| Chainguard | ruby3.2-rails-7.2 | 7.2.3.1-r1 |
| Chainguard | ruby3.2-rails-7.2 | 7.2.3.1-r2 |
| Chainguard | ruby3.2-rails-8.0 | 8.0.5-r0 |
| Chainguard | ruby3.4-rails-7.2 | 7.2.3.1-r1 |
| Chainguard | ruby3.4-rails-8.0 | 8.0.5-r1 |
| Chainguard | ruby3.4-rails-8.0 | 8.0.5-r2 |
| Debian 13 | ruby-rack | 3.1.20-0+deb13u2 |
| Debian 14 | ruby-rack | 3.2.6-2 |
| Ubuntu 24.04 LTS | ruby-rack | 2.2.7-1ubuntu0.7 |
| Ubuntu 25.10 | ruby-rack | 3.1.16-0.1ubuntu0.3 |
| Ubuntu 26.04 LTS | ruby-rack | no fix |
| Ubuntu Pro 14.04 LTS | ruby-rack | 1.5.2-3+deb8u3ubuntu1~esm11 |
| Ubuntu Pro 16.04 LTS | ruby-rack | 1.6.4-3ubuntu0.2+esm10 |
| Ubuntu Pro 18.04 LTS | ruby-rack | 1.6.4-4ubuntu0.2+esm10 |
| Ubuntu Pro 20.04 LTS | ruby-rack | 2.0.7-2ubuntu0.1+esm10 |
| Ubuntu Pro 22.04 LTS | ruby-rack | 2.1.4-5ubuntu1.2+esm3 |
| Wolfi | kube-fluentd-operator | 1.18.2-r60 |
| Wolfi | kube-fluentd-operator | 1.18.2-r67 |
| Wolfi | logstash-9.1 | 9.1.10-r6 |
| Wolfi | logstash-9.1-bitnami-compat | 9.1.10-r6 |
| Wolfi | logstash-9.1-iamguarded-compat | 9.1.10-r6 |
| Wolfi | logstash-9.1-with-output-opensearch | 9.1.10-r6 |
| Wolfi | logstash-9.2 | 9.2.8-r2 |
| Wolfi | logstash-9.2-iamguarded-compat | 9.2.8-r2 |
| Wolfi | logstash-9.2-with-output-opensearch | 9.2.8-r2 |
| Wolfi | logstash-9.3 | 9.3.3-r2 |
| Wolfi | logstash-9.3-iamguarded-compat | 9.3.3-r2 |
| Wolfi | logstash-9.3-with-output-opensearch | 9.3.3-r2 |
| Wolfi | ruby3.2-rails-8.0 | 8.0.5-r0 |
| Wolfi | ruby3.4-rails-8.0 | 8.0.5-r2 |